Dear HS1
To Be a PLC engineer and sole player in the project you should now the following
1- How to make the site survay and determine exactly your needs for this project .
2-to have the ability to configure the requiered PLC for the project including DI,DO,AI,AO,Special Modules,Communication...etc
3-You should know at least one of the PLC programming langauges.
4-you should have the ability to prepare paper works such as I_O list,Cable Sheets,Cable Routes,Tag list,PLC Addresses---etc.
5-You should now haow to deal with different kind of sensors,transmiiters and different Field devices.
5-you should know about the commissioning and start up procedures like I_o testing,cable testing, Dry run for motors...etc
I which all the best of luck